The Merilas 577nm short pulse is a powerful yellow laser system designed to treat retinal disorders. Meridian’s short pulse technology delivers a tissue-sparing solution that allows the tissue to cool between laser pulses. This minimises or prevents tissue damage, reducing treatment risks. Patient comfort and safety is improved as no tissue damages or scars occur.

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Yellow laser
photocoagulator
for all retinal photo-
coagulator procedures

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PROVEN RELIABILITY –
COMPACT, PRACTICAL AND POWERFUL
The Merilas 577 shortpulse ophthalmic yellow laser photocoagulator fea-
tures dual treatment modality: subthreshold with microsecond pulses or continu-
ous wave delivery mode.

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SUPERIOR QUALITY & LONGEVITY
The Merilas housing is made of a high grade aluminium giving Meridian’s unique
solid feeling. The removable control panel features a crystal interface that is resist-
ant, durable and easy to clean.
The thermoelectric cooling (TEC) system eliminates the need for ventilation slots,
making a hermetically sealed unit, ensuring a dust-free system, increasing the lon-
gevity of the laser.

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USABILITY
The Merilas lasers have intuitive commands, and are easy to use ​
​
The detachable touch display with glass technology ensures flexibility and provides
a greater ergonomic design. The user interface is straightforward to use, thanks to
its intuitive design. Due to its thermoelectric cooling system, there are no disturbing
noises or air turbulences. ​
​
The Merilas lasers impress users with their modern, compact presentation and ease
to transport. Each laser comes with a robust and practical carry-on case.

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SAFETY
Auto key connector: Merilas lasers recognise the original probes and accessories
connected to the console.
■ Merilas laser delivers stable laser output​
■ Each laser accessory is calibrated and measured independently ​
■ Safe in the cornea
■ Remote support access

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FLEXIBILITY & COMFORT
Our slit lamp delivery systems are designed to work with a wide range of slit lamp
brands, either Haag-Streit or Zeiss styles. The Merilas lasers can be used with laser
indirect ophthalmoscopes and endo probes. ​
​
Our technicians can support you via remote service in case you need assistance.
This function allows fast and professional troubleshooting.

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LASER EXCELLENCE
The history of Meridian AG, now showing up as Meridian Medi-
cal Group, and the history of the medical Nd:YAG laser are closely
connected. The Microruptor II developed by Meridian engineers and
Dr Frankhauser changed the way of many ophthalmology treatments. ​
New technology is continuously developed and patented by our de-
velopment engineers. We select and integrate the best Swiss
and European laser components to ensure the highest quality
and long-term reliability. We use tested and reliable best practices in
engineering and integration, ensuring our systems’ highest perfor-
mance. Our highly skilled and experienced staff works to deliver the
service and results our customers deserve and have come to expect.
TIPS FOR YOUR LASER
■ Yearly maintenance service assures the optimal performance of
your laser​
■ Follow the safety advice of the manufacturer and your regulatory
body​
■ Follow the intended use described in the IFU

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CLINICAL INDICATION
Photocoagulation:
Retinal photocoagulation, panretinal photocoagulation (PR) and intravitreal endo-
photocoagulation of vascular and structural abnormalities of the retina and choroids,
including:
■ Proliferative and non-proliferative diabetic retinopathy
■ Choroidal neovascularization
■ Branch retinal vein occlusion
■ Age-related macular degeneration
■ Retinal tears and detachments
■ Retinopathy of prematurity
■ Macular edema
■ Lattice degeneration
■ Central retinal vein occlusion
Iridotomy:
■ Iridotomy in angle closure glaucoma
Trabeculoplasty:
■ Trabeculoplasty in open angle glaucoma

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WAVELENGTH BENEFITS – WHY 577 nm?
■ The yellow wavelength 577 nm causes less retinal burns and therefore less scotoma formation
■ This gives the physician better control over the interaction between the laser beam and tissue
■ The yellow light is not absorbed by xanthophyll, making it ideal for macular treatments
■ Because it also produces less scattered light, it penetrates existing opacities better and reaches the tissue more precisely
532 577 810
3000
1000
100
450 500 550 600 650 700 750 800
10
500
50
5
1
Xanthophyl
Absorption
Coefficient
(1/cm)
Wavelength (nm)
Melanin RPE
Hemoglobin (Hb)
Oxyhemoglobin (HbO2)
Melanin CH

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THE PRINCIPLE OF SHORTPULSE
■ In shortpulse mode a pulse duration consists of many alternating short bursts and
intervals
■ In contrast to the continuous wave (CW) mode, the tissue is not heated very much
in the shortpulse mode – tissue is treated more gently
burst duration burst
interval duration
90 % 100 %
10 %
short pulse
interval
duration
short pulse
duration
short pulse
period
duration
example
10 % duty
cycle
power

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PHOTOCOAGULATION – TREATMENT GUIDELINES FOR
SHORTPULSE LASERS
These guidelines have been prepared following industry standards retinal treatments, the use of the laser and its parameters are respon-
sibility of the treating ophthalmologist.
Procedure Spot size(*) Exposure Periferal burn Duty cycle
PRP ( Periphery ) 300 – 400 μm 200 mS 3 × 5 %
DME 100 – 200 μm 200 mS 2 – 4 × 5 %
DME+RVO 100 – 200 μm 200 mS 2 – 7 × 5 %
(*) Spot size on macula including the lens magnification factor
Suggested parameters for the Posterior Segment taken from Bloom & Bruckner (1997) “Laser Surgery of the Posterior Segment”
PERIPHERAL BURN FACTOR
When using Shortpulse it is necessary to perform a laser shot to test the melanin response. Apply a burn shot away from the fovea, titrate
the power until achieve blanching. Starting with a spot size of 100 – 200 μm, power 50 – 100 mW and exposure of 200 mS then slowly
increase energy until produce a barely visible burn.
The power is multiply to compensate the short pulse duration.
BINOCULARS IN FOCUS
Each user must have the oculars set for their personal refraction, this way the laser will be in parfocality with the aiming beam and retina.
Defocused slit lamp may result in unpredictable laser burns.
TEST SHOTS
■ Always assure perfect retinal focus before delivering the treatment
■ Perform a series of SINGLE SPOT shots in the periphery to test the melanin response, for your test
shot aim for a blanching or light burn
■ Start with the lowest recommending power and the shortest exposure time
CW TREATMENT
For CW guidelines, please refer to Merilas 532α Guidelines.

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STANDARD ACCESSORIES
■ Foot switch
■ Transport case
■ Safety goggles
OPTIONAL ACCESSORIES
■ Slit lamp adapters
■ Laser indirect ophthalmoscope
■ Safety filters (passive & active)
■ Endoprobes
■ External fan

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SLIT LAMP ADAPTER –
HAAG-STREIT BQ INTEGRATED DESIGN
Meridian proudly integrates its lasers to the Haag-Streit BQ, and it is the only laser
company partnering with Haag-Streit. The specially designed, high-quality filter for
the Haag-Streit BQ, fits perfectly on this slit lamp, providing an uninterrupted view
and access to the slit lamp on 577 or 532 nm wavelengths. Meridian filters provide
unparallel light transmission with protecting the user’s eyes.
UNIVERSAL DESIGN
Merilas universal slit lamp adapter allows coupling with almost any Haag-Streit slit
lamp, original or copy.
The adaptor has multiple moving parts to assure excellent adaptability to the many
Haag-Streit style slit lamps, the robust material enclosing the fibre ensures its
durability.
ZEISS STYLE SLIT LAMP ADAPTER
Meridian offers a Zeiss-style slit lamp adapter designed for the lower illumination
tower, allowing seamless interaction with the German slit lamp and lasers like the
Nd:YAG MR Q.

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DELIVERY SYSTEMS – LIO – FEATURES
■ Optimized for the Merilas platform
■ Laser delivery coaxial to the users viewing axis
■ Standard LED module
■ Neutral LED cooler color providing brighter illumination and longer battery life
■ High-contrast optics
■ Built-in filters
■ Intelligent optical system with automatic optics and mirrors adjustment
■ High magnification lens with additional 1.6 x magnification
DELIVERY SYSTEMS – LIO – TECHNICAL SPECIFICATIONS
Description Mode
Spot size 1100um ± 20%
Working distance
(front of LIO to focused spot)
280mm ± 20%
Operating wavelengths (Factory configured
to one therapy wavelength
Therapy laser: 532 nm, 577 nm or 810 nm up to 2000 mW
pulsed
Aiming laser: 635 nm, 1 mW
Back-scatter protection OD > 5.5 at therapy wavelength
Laser Fiber 100 µm core, multimode with A/R coating
3 mm stainless steel protected
5 m length
SMA905 laser termination
Power Source Wall mounted wireless charger including spare lithium battery

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DELIVERY SYSTEMS – PROBES –
Our probes are manufactured by EMTRON, following strict quality control. The high-quality pol-
ished fibre surfaces result in homogenous laser spots with evenly distributed power across the
entire area, eliminating the potential risk for the formation of “hot spots” in the treatment area.
SAFETY
The endo probes enjoy unique features such as unique serial numbers assuring the highest possi-
ble traceability. All endo probes are CE-marked and individually sterilized for single use.

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DELIVERY SYSTEMS – AVAILABLE PROBES –
The probe design incorporates a proprietary ergonomic design, resulting in a comfortable grip.
The handpiece is well balanced for precise and safe fibre guidance resulting in unsurpassed treat-
ment precision. The laser port is a standard SMA connector, providing users with a higher degree
of versatility.
type Features and Advantages
Straight
(standard laser probe)
■ Basic endophotocoagulator for nonperipheral retinal
locations
■ Most efficient delivery of thennal energy
■ Ease of entry through small gauge cannulas
■ 20G, 23G, 25G and 27G series
Curved
(versatile)
■ Curved for ease of entry through small gauge
cannulas
■ Unique curve for efficient spot placement at far
peripheral locations
■ Versatile for central or peripheral use
■ 20G, 23G and 25G series

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TECHNICAL SPECIFICATIONS*
Device description Merilas 577 shortpulse |
Safety Classifications Class 4
Wavelength 577 nm
Power Output 50 – 2500 mW
Pulse Duration CW (continuous wave, pulsed)
1 ms – 5 000 ms
Pulse Interval 1 ms – 5 000 ms
SP-Mode Settings shortpulse (continuous wave, chopped)
shortpulse duration: 0.01 – 9.5 ms
shortpulse interval: 0.1 – 9.5 ms
Cooling TEC
Aiming Beam Diode 635 nm, (0-1 mW in 9 Steps)
Dimensions 25.0 × 22.0 × 10.5 cm
Total Weight 7.0 kg
Power Requirements 100 – 240 V, 50/60 Hz, 2 A max.
* All technical specifications are subject to change without notice. In accordance with the international general safety standards: IEC
60601-1:2005/AMD1:2012,, IEC 60601-1-2:2014, MDD 93/42/EEC. The laser safety is in accordance with the international standards: IEC
60825-1:2014 and IEC 60601-2-22:2007/AMD1:2012.
250
mm
/
9.84“
105
mm
/
4.13“
220 mm / 8.66“
0633

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Meridian Medical Group
Head office
Tel.: +41 33 334 11 11
Fax: +41 33 334 11 19
info@meridian.ch
www.meridian.ch
Switzerland
Meridian AG
Bierigutstrasse 7
CH-3608 Thun
Slovenia
Meridian Medical d.o.o.
Plemljeva ulica 8
1210 Ljubljana-Sentvid
Finland
Meridian Medical Oy
Elannotie 5
01510 Vantaa
280002 Brochure_ Merilas_577 Rev. A(0)
Copyright © Meridian AG, 3608 Thun, Switzerland